Thirteen-sided polyhedron form



FIG. 1 is a top view of a thirteen-sided polyhedron form showing my new design;

FIG. 2 is a bottom view thereof;

FIG. 3 is a first side view thereof;

FIG. 4 is a second side view thereof;

FIG. 5 is a third side view thereof;

FIG. 6 is a top front perspective view thereof; and,

FIG. 7 is a top plan view of the thirteen-sided polyhedron form in a unfolded out position. 

CLAIM I claim the ornamental design of the thirteen-sided polyhedron form, and shown and described. 